In this configuration the on-axis image is produced at the real hyperbolic focus (fₛ₂) but off-axis performance suffers.
[…] until Athene had scalped, rebodied, and revived her — whereupon her first request was to redie at once if she was Gorgon still. An odd thing was that, once brought back, she could recall all her dead head's doings […]
“You needn’t stray off too far in doin’ it,” his partner admonished. “If that pack ever starts to jump you, them three cartridges’d be wuth no more’n three whoops in hell. Them animals is damn hungry, an’ once they start in, they’ll sure get you, Bill.”
Not long ago, it was difficult to produce photographs of tiny creatures with every part in focus.[…]A photo processing technique called focus stacking has changed that. Developed as a tool to electronically combine the sharpest bits of multiple digital images, focus stacking is a boon to biologists seeking full focus on a micron scale.
